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my MacBook Air has no output sound, I have tried resetting the PRam, SMC and updating os, when I done a diagnostics on it error code VFF001
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Try holding down the option (alt) key and clicking the speaker icon in the top bar. Then click by output device the Internal Speaker.
I can't promise it works but it's worth trying.
crwdns2934105:0crwdne2934105:0
Same mbp, same error code VFF001. Also SMC reset did not fix.
Note however, I still have audio on the HDMI, like when connected to a TV. And I can use air-play, and possibly blue-tooth devices, like headphones/speakers. So these may be a work-around if not worth it to fix the mbp.
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If it’s a MacBook Air, the Cirrus Audio chip is located on the IO board. Replacing the IO board resolves the VFF001 alert in most instances. If it’s a MacBook Pro, inspect the area where the Cirrus Audio IC is located - it’s not as easily replaced as it is on the Air.
The VFF001 alert doesn’t appear when the headphone port is dirty / obstructed, it usually only appears when there is chip/component/trace damage affecting the audio circuit.
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Try going into Settings to unclick the mute button. If that doesn't work, try using the software to Restart. If that doesn't work, try doing a manual Restart to get into Settings. When I upgraded my MacBook Air with the latest OS, it dropped the 123 password & went back to the original owner password, so I can't get past the login :-/.
crwdns2934271:0crwdnd2934271:0 Loy Lum crwdne2934271:0